Bolster-spring.



'No. 719,000. PATENTED JAN. 27, 1903.

N. HALVORSEN. BOLSTER SPRING.

APPLICATION FILED OUT. 27, 1902. N0 MODEL.

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NELS IIALVORSEN, OF STOUGHTON, WISCONSIN.

BOLSTER-SPRING.

SPECIFICATION forming part of Letters Patent No. 719,000, dated January2'7, 1903.

Application filed October 27, 1902. Serial No. 128,949. (No model.)

To aZZ whom it may concern.-

Be itknowu that LNELS HALVORSEN, a citizen of the United States,residing at Stoughton, in the county of Dane and State of Usconsin, haveinvented certain new and useful Improvements in Bolster-Springs; and Ido declare the following to be a full, clear,and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the figures of reference marked thereon,which form a part of this specification.

This invention relates to vehicle-springs, and especially tobolster-springs for wagons.

The object of the invention is to provide a spring of this class withdevices or attachments which will prevent the body of the vehicle fromsagging on one side when the load is heavier on that side than on theother. The spring and its attachments are so arranged that the body ofthe vehicle will be depressed evenly on both sides no matter where theload happens to be placed. This relieves the driver from the necessityof carefully stowing the load so as to distribute the weight evenly overthe entire body and also pre vents the body from swaying downward on oneside undera sudden lurch of the vehicle. I accomplish this by attachingequalizing-levers to the bolster, the top or hearing bar, and theinterposed spring, as hereinafter more fully set forth, and particularlypointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of abolster-spring embodying my improvements. Fig. 2 is a top plan View ofthe same, and Fig. 3 is an end view.

The bolster proper, 1, has at each end the usual standards 2 to guidethe top or hearing bar 3 and confine the body of the vehicle. At eachend of the bolster is a shackle at, in which are pivot-ally secured theends of the lower member of the spring proper-such, for instance, as themain and truss springs 5 6- in accordance with the construction shownand described in my Patent No. 710,969, dated October Il, 1902. Theupper member 7 of the spring is secured to the middle of the lowermember by the clip 8, its ends being received in loops 9, depending fromcastings 10, attached to the ends of the bearingbar and having ears 11engaging with the standards 2.

Pivotall y attached to each shackle and running to the casting at theopposite end of the bearing-bar is a lever 12. The connection with thecasting 10 is by means ofa stud 13 and slot 14 to permit the bearing-barto play freely up and down. The leversare fastened at an intermediatepoint to the clip 8, which secures together at their middle points theupper and lower members of the spring. The levers preferably stand outof line with the bearing-bar, so that the'latter can move up and downbetween them, as shown in the drawings; but thisis not an essentialarrangement. Moreover, instead of using only one spring, as shown, I mayuse two parallel springs, as is common in devices of this kind, andapply my equalizing-levers thereto in a manner so obvious thatit doesnot need illustration.

In operation the levers transmit to the middle of the spring any loadapplied at any point on the bearing-bar, so that the spring will bedepressed evenly and not at one end only in case the load is not welldistributed. The result is that the bearing-bar always preserves itsparallelism with the bolster and the body of the vehicle will not sag ortilt to one side under an uneven load or under a sudden lurch.

Having thus described my invention, what I claim is- 1. The combinationwith a bolster and bearing-bar, of a spring interposed between them,andequalizing-levers connected respectively to opposite ends of the bolsterand the bar, and both connected at an intermediate point with the middleof said spring.

2. The combination with a bolster and bearing-bar, of a shackle at eachend of the bolster, a spring having a lower member secured to saidshackles, and an upper member secured to the lower member at its middle,castings on the bearing-bar receiving the ends of the upper member ofsaid spring, and equalizing-levers pivoted to said shackles andconnected with said castings, and fastened to the middle point of saidspring.

In testimony whereof I affix my signature in presence of two witnesses.

NELS HALVORSEN.

\Vitnesses:

H. A. HUBER, GEO. R. MOMANUS.

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